Connected: An Internet Encyclopedia
RFC 1123 - 5.3.1 SMTP Queueing Strategies

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### 5.3.1 SMTP Queueing Strategies

The common structure of a host SMTP implementation includes user mailboxes, one or more areas for queueing messages in transit, and one or more daemon processes for sending and receiving mail. The exact structure will vary depending on the needs of the users on the host and the number and size of mailing lists supported by the host. We describe several optimizations that have proved helpful, particularly for mailers supporting high traffic levels.

Any queueing strategy MUST include:

- Timeouts on all activities. See Section 5.3.2.

- Never sending error messages in response to error messages.

5.3.1.1 Sending Strategy
5.3.1.2 Receiving strategy

Next: 5.3.1.1 Sending Strategy

Connected: An Internet Encyclopedia
RFC 1123 - 5.3.1 SMTP Queueing Strategies